Data Interpretation — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. A line graph is best for showing change over time.
Line graphs show time on the x-axis, making them ideal for tracking change across days or weeks.
2. When the line drops from one point to the next, the value is decreasing.
A downward slope means the value decreases between those two recorded times on the line graph.
3. If temperature rose from 60 to 75 degrees, the increase is 15 degrees.
Subtracting sixty from seventy five gives an increase of fifteen degrees between the two readings.
4. If a plant grew 2 cm each day for 5 days, the total growth is 10 cm.
Two centimeters per day for five days equals ten centimeters of total growth across the week.
5. The steepest part of a line graph shows the greatest change in value.
Steeper sections show bigger jumps in value, meaning the greatest change happened during that interval.
6. On a double bar graph, two bars side by side share the same category.
Paired bars share the same x-axis category so you can compare two groups for that single label.
7. A graph showing favorite fruits in a class is best as a single bar graph.
A single bar graph fits one data set, like favorite fruits, where each fruit gets one bar.
8. If a line graph levels off, the trend is becoming steady.
A flat section signals a steady trend, where values stay nearly the same across recorded points.
9. If sales went up then down, the line graph shows a mixed trend overall.
A line that rises and falls shows a mixed trend, with both increases and decreases over time.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Show this year vs last year sales
→ Double bar graph
Double bar graph
Track weekly temperature
→ Line graph
Line graph
Show favorite pet survey
→ Single bar graph
Single bar graph
Show 100% of class by sport
→ Pie chart
Pie chart
Different graphs match different goals, so picking the right one makes the data clearer to readers.